Electromagnetic locking-switch.



No. 828,090. PATENTED AUG. '7, 1906. H. M. CRANE. ELBGTROMAGNETIG LOCKING SWITCH.

APPLICATION FILED MAY 9,1904.

UNlTED neuer nessun, or new Your, n. r., .Assiettes ro wrtsrnan nnscrnrc consi-iur. or cniceoo. missers. i consorten-1in' or rLLinois.

IEl..ESTR@tritt@lllEWG LOCKlNGQeSWlTGEE ne. Sceneo.

ySf'peclcation of Letters Patent.

Patented fitug. "i,

Application led hsy 9, 1904. Serial No. 207.026.

To @ZZ .whom it may concern? Be itJlmown that l, HENRY lvl. CRANE, a citizen of the United States, residing at New York, in the county of New Yori: and State of N ew York, have invented a certain new andtheparts, improvements, or combinations which l regard as novel will be pointed out in the appended claims.

ln the drawings, Figure l is a view in elcvation of my improved locking-switch, a portion of its containing-case being shown in section. Fig. 2 is a rear view.' Fig. 3 is a diagram illustrating electrical connections. Fig. lis a view similar to Fig. l with the parts in an' alternative position. Fig. 5 is a sectional view on line 5 5 of Fig. 2.

The same letters of reference are used to designate the same parts in each oi the iigures of the drawings.

The switch-levers, carrying a spring-contact b, is pivoted at 'c' .to tne end of one arm of an lli-shaped iron yoke-piece c. This switch is connected with the plunger or push- 'button d, by which it may be actuated. When the plun er is pushed in, the sprin -contact b is forcer 4against a contact-envi b5. he contact thus made is arranged to complete the circuit of s locking-magnet e. I The -armaturefof the magnet is pivoted atf to the lower end. ci the yoke-piece c and extends in a direction to moet the free end of the switchlever ct. The core of the magnet e is mount-,r

ed upon the yoke-piece c, and the magnetic circuit thereof includes the armature-leverf and the switch-lever a., which is made of magnetic material and acts as a return pole-piece.

The inner face oi the switch-lever is beveled at c2, and when the armature stop-lever is attracted by the' magnet e its end engages this beveled portion a2 of the switch-lover, whereby the switch-lever is not only prevented from being retracted, but is actually pressed toward the contact-anvil t against the tension of 'the spring g. W hen the arma-- ture stop-lever fis in its normal position, un-

attracted by the magnet e, it rests against thehead of a supporting-pin lt, the shank whereof passes through a hole in the armature and is secured in the end ci the magnetcore. f

rlhe circuit connections are shown in Fig. 3, where the application of my improved self-lookin switch to the control ci a signalcircuit `is ilustrated. The circuit from hattery 7c includes a lamp-signal m and the normally closed contacts of an interrupting-key l n and is controlled by the contacts il? of the self-locking switch, the circuit also including the windin ci the electromagnet e of said switch. en the push-button d is pressed, the switch-lever c is moved'irom the position shown in Fig. l to the position shown in l* lgs.

4 and 5, closing the spring-contact b against its anvil and thus completing the circuit from the battery through the magnet e andl also through the signal device'm at the distant point. current in this circuit draws up its arma- .ture f, bringing the end of said armature into engagementwith the beveled facea2 of the switch-lever c. The switch-lever is `thus locked in its actu ated position, and the signal m will be continuously displayed, subgect only to the control of the'interrupting-switch n. mien the switch n is opened, the circuit will ci course be interrupted, and the electromagnet e being no longer excited will allow its armature to drop back, thus permitting the switch-lever c to be returned to its normal position. by the spring g. 'l

arrangement such asthat shown in Fig. 3V will be useful, for instance, as a hotel annunciator system, where the lamp-sicfnals, with their interrupting-switches, will oe located at e central point,V with lockingswitches, such as herein described, in the diiferent rooms to control the respective signals.

lt will be readily understood that the device of my invention will require but a very slight amount oi current to o crate the locking mechanism. The actua movement of the switch parte to their actuated position is brought about manually, so that the only part to be moved by the electromagnet 1s simply the armature stop-lever j", and when The magnet e being excited by IOO this armature is drawn up it l'orms a eoiiiplete magnetie circuit with llie switch-lever a, with which it is engaged. 'l`he arrangement of the stop-lever to engage a beveled, 'laee ol' the switeli-lever is iulvaiitageous, not only in that the attractive movement ol' the armature assists in pressing thel switeh-eontact It against its anvil, but when the magnet is deenergized the pressure of the beveled face of the switeli-lever against the end ol" the armature will serve to return the ariiuiture positively to its normal position.

l claim* 1. In a self-looking switch7 the r-oiiibination with an eleetromagnet, ol" a return polepiece therefor, a lever pi voted upon said polepiece, a push-button for moving said lever, sWitcli-eontinits closed by said lever when iiioved by said push-button, and an armature for said magnet pivoted to said pole-piece and adapted when attraeted to abut against said levei'to hold the same in its artuated position.

2. ln a self-locking switch, the combination with a switch-lever, and means l'oi' actuating the saine, said switch-lever earrying a contact part on one side and having a beveled face on the other side, oll an elet-.ti'oiiiagnet and a circuit thorel'or controlled by said eontaet, and an arii'ature l'or said electromagnet, adapted when attracted to engage the beveled face of said switch-lever, whereby the eontaet is held closed.

3. rlhe combination with an L-sliaped iron yoke-piece, oll a switch-lever pivoted at one end ol" said yoke- )ieee7 a eoiitaet part carried by said switch-lever, a eoiitaet-anvil against wliieh said contact pintas pressed when the switch-lever is actuated,V- an arma ture forming a stop-lever pivoted at the other end ol' said vokepieee, said swit ili-le\ er liaving a beveled face adapted to be engaged bv the end of the armature when drawn up, and an eleetroinagnet having its core mounted upon said yol e-pieee in position to draw up the armature stop-lever when the magnet is exeited. said switch lever and armature meeting to complete a magnetic circuit, whereby the switch is held in il.` acl iiated position by a iiiiiiiiiilliii attractive lorre oll said electroniagiiet.

4. The (-.oinbination with an eleet`i'oiiiag' inet, ol a yolie-pieee at the heel ol' the eure tion with an eleetroiiiagiiet, of a return polepieee thorolor7 a switch-lever pivoted at one end ot' said pole-pieee, a )usb-button ineehiuiiiallyr united with said lever to move the same, contacts elosed by said member when moved outwardly by said push-button, and an armature lor said magnet pivoted to the other end of said i'iole-piece, the free end of said armature when attracted abutting against the inner face oll the free end of said lever to maintain the lever in its actuated position.

ti. ln a sell'-loekiiig switch, the combination with an eleetroniagiiet ol a switch-lever made of magnetic material and constituting a return pole-piece l'or said magnet, an armature lor the magnet, said armature being engaged by said switch-lever and normally held therebyr in its` unattraeted position, and a nish-button adapted to move said switchlever to permit ol' the movement of the armature, said armature when in its attracted position boing adapted to revent the return movement of said switchever.

lii Witness wlieireot` i hereunto subscribe my name this (ith day ofApril, A.D.1904.

infinitif M .enaNE iVitnessesz A. Hman/ron, F. L. Gummi. 

